. >> we have to not constantly assume that it's not possible for iran, like any country, to change over time. it may not be likely. you know, if you asked me, what is the likelihood we're able to arrive at the end state i was just describing earlier, i wouldn't say that it's more than 50/50. but we have to try. >> joining me now is democratic senator benn cardin. >> pleasure to be with you. >> let's talk about the president. he's putting the chances of success at about 50/50. where do you put it? >> well, it's difficult to have a lot of confidence in what iran is doing. we know that they are still proceeding with a nuclear weapons program. we now have this interim agreement. we have to make sure that it is carried out to the letter and that there's negotiations to an agreement that would eliminate iran's capacity to enrich uranium to a nuclear fuel capacity for a weapon. and that's the challenge. as the president pointed out, we're going to have to be very cautious. we certainly shouldn't ease up the pressure we have on iran today. >> president rouhani told his parliament today, sir, th